Find the vector and parametric equations for the line through the point P(0, 0, -3) and parallel to the vector -21-5j+4k. Vector Form: r = 00-3)+4) Parametric form (parameter t, and passing through P when t = 0): x = x(t) y=y(t) z = z(t) Find an equation of a plane containing the three points (4, 5, -3), (6, 7, -1), (6, 8, 1) in which the coefficient of a is 2. = 0.